Phosphorus release from phosphate rock and iron phosphate by low-molecular-weight organic acids

Abstract： Low-molecular-weight(LMW) organic acids widely exist in soils, particularly in the rhizosphere. A series of batch experiments were carried out to investigate the phosphorus release from rock phosphate and iron phosphate by Iow-molecular-weight organic acids.Results showed that citric acid had the highest capacity to solubilize P from both rock and iron phosphate. P solubilization from rock phosphate and iron phosphate resulted in net proton consumption. P release from rock phosphate was positively correlated with the pKa values. P release from iron phosphate was positively correlated with Fe-organic acid stability constants except for aromatic acids, but was not correlated with PKa. Increase in the concentrations of organic acids enhanced P solubilization from both rock and iron phosphate almost linearrly. Addition of phenolic compounds further increased the P release from iron phosphate. Initial solution pH had much more substantial effect on P release from rock phosphate than from iron phosphate. 作 者： XU Ren-kou    ZHU Yong-Guan    David Chittleborough   作者單位： XU Ren-kou(Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)

ZHU Yong-Guan(Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)

David Chittleborough(Soil and Land System, School of Earth and Environmental Sciences, The University of Adelaide, SA 5005, Australia) 

期 刊： 環(huán)境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(1)  分類號： X131.3  Keywords： organic acid    phosphate release    rhizosphere    rock phosphate    iron phosphate   

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